Pentair HAFFMANS GMT - Replacing the Thermometer; Replacing the Electrical Unit (PCB)

HAFFMANSGMT
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GMT Page 23 of 37
8.2.3 Replacing the thermometer
Method:
1. Remove the burette (pos. 111) according to the instructions given on page 14,
2. Fit the thin wire (included in the service set) behind the thermometer are carefully tilt it,
3. Use your thumb to exert a small counter pressure on the top of the thermometer and
pull it, together with the wire, out of the instrument,
4. Lubricate the new thermometer’s metal sealing tube using silicon grease,
5. Install the new thermometer.
8.2.4 Replacing the electrical unit (PCB)
Method:
1. Unscrew the two screws (pos. 77) and carefully remove the electrical unit from the
instrument.
2. Check the electrical unit by activating the micro switch on the PCB. If the LED remains
lit for approximately 15 seconds, the electrical unit is not faulty and does not have to be
replaced.
If the LED does not light up:
3. Disconnect the PCB.
• Unscrew the screws for the red and blue contact wires (these wires connect the PCB to
the battery’s contact spring).
• Unscrew the PCB’s two attachment screws (pos. 105-8).
• Unscrew the 2 attachment nuts (pos. 105-5).
• Remove the red and blue wires on the rear of the PCB.
4. Fit a new PCB (this is supplied as a complete unit).
5. Connect the PCB’s contact wires to the battery’s contact spring.